Kernel not found in Mac OS due to issue with libzmq

[pritesh-shrivastava]

I have both Racket and Jupyter installations running fine with even after installing zeromq with the commands given, I'm getting the following error on Mac OS Mojave :

[I 22:28:50.853 NotebookApp] Kernel started: 683b7f31-d457-4c9d-9f2b-14997b30c92e, name: racket
Kernel starting.
zmq-socket: could not find libzmq library
  error: "ffi-lib: couldn't open \"libzmq.5.dylib\" (dlopen(libzmq.5.dylib, 6): image not found)"
  context...:
   /Users/priteshshrivastava/Library/Racket/7.6/pkgs/zeromq-r-lib/main.rkt:222:0: zmq-socket
   /Applications/Racket/collects/racket/contract/private/arrow-val-first.rkt:555:3
   /Users/priteshshrivastava/Library/Racket/7.6/pkgs/iracket/private/jupyter.rkt:324:2: serve
   /Users/priteshshrivastava/Library/Racket/7.6/pkgs/iracket/private/jupyter.rkt:321:0: call-with-services
   /Users/priteshshrivastava/Library/Racket/7.6/pkgs/iracket/iracket.rkt:12:0: start-kernel
   (submod "/Users/priteshshrivastava/Library/Racket/7.6/pkgs/iracket/iracket.rkt" main): [running body]
   temp35_0
   for-loop
   run-module-instance!

[emeinhardt]

I'm on Catalina and experiencing the same issue. I've had Jupyter up and running (with a variety of language kernels) for months and installed Racket minutes before trying to get the current version of iRacket up and running.

[CadeMichael]

I have the same issue was working then randomly stopped and threw that error

[doug14226]

I solved this problem by copying /usr/local/Cellar/zeromq/4.3.3/lib/libzmq.5.dylib
to /Applications/Racket\ v8.1/lib/.

I installed both Racket and zeromq with homebrew on MACOS Catalina 10.15.7
The problem is Racket's search path

BTW I assume a link from /Applications/Racket\ v8.1/lib/ to /usr/local/Cellar/zeromq/4.3.3/lib/libzmq.5.dylib would work as well.

[pritesh-shrivastava]

I solved this problem by copying /usr/local/Cellar/zeromq/4.3.3/lib/libzmq.5.dylib
to /Applications/Racket\ v8.1/lib/.

I installed both Racket and zeromq with homebrew on MACOS Catalina 10.15.7
The problem is Racket's search path

BTW I assume a link from /Applications/Racket\ v8.1/lib/ to /usr/local/Cellar/zeromq/4.3.3/lib/libzmq.5.dylib would work as well.

This solves the problem for me as well. I'm using Mac OS Mojave 10.14.6.
Make sure to update the final path based on Racket version.

[mpcjanssen]

I am not a fan of copying files installed by a package manager to other places on the system. It clutters up your drive and can lead to issues when trying to uninstall.
IMO a better approach is to chance the lib-search-dir racket uses to find dynamic libraries. This can be achieved by something like:

cat /Applications/Racket\ v8.3/etc/config.rktd

#hash(
(build-stamp . "") 
(catalogs . ("https://download.racket-lang.org/releases/8.3/catalog/" #f)) 
(doc-search-url . "https://download.racket-lang.org/releases/8.3/doc/local-redirect/index.html") 
(lib-search-dirs . (#f "/opt/homebrew/lib")))